CRC 1316 Transient Atmospheric Plasmas: From Plasmas to Liquids To Solids

A1 A2 A3 A4 A5 A6 A7 A8 A9 B1 B2 B4 B5 B7 B8 B11 B12 B13 B14 B15 INF MGK PR

B7: Reaction chemistry of plasmas in liquids interacting with surfaces

Principal Investigators: K. Grosse, A. von Keudell

Team


von Keudell, Achim
(Principal Investigator)

Pottkämper, Pia-Victoria
(PhD)

Riabosthan, Mariia
(Staff)

Description

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Plasmas in direct contact with liquids or plasmas inside liquids allow a high mass transfer of reactive species from the gas phase into the liquid. If these plasmas in liquids are interfaced with solids, very fast and efficient reaction rates for surface reactions can be realised. Such systems are relevant for the field of degradation of toxic organic compounds in liquids, plasma enhanced anodisation of metal surfaces inside an electrolyte, or as a method to recover a catalytic surface in an electrochemical cell. In this project, FTIR spectroscopy in the attenuated reflection mode will be used to probe the plasma-liquid-solid interface directly. The liquid chemistry is assessed using optical absorption spectroscopy in the visible spectral range. This method is employed to analyse aluminium oxide that is created during plasma enhanced oxidation (PEO) in a liquid. By monitoring the different oxygen bonds, the progress of the anodisation process is monitored. Similar, the degradation of an oxidized copper surface used as catalyst for CO2 dissociation in an electrochemical cell is monitored in-operando. By striking a plasma at the liquid-solid interface, the recovery of the catalyst surface is monitored. Finally, the influence of in-liquid-plasma on the efficiency of a biocatalyst is evaluated. In all these experiments, the effects on the surface and in the plasma can be separated, because the broad absorption features of the TO and LO phonon of the metal oxides can easily be distinguished from the narrow absorption bands of the free gas molecule created in the plasmas. The reaction sequences at the plasma-liquid-solid interface are elucidated by connecting the variation of the surface processes, with that of the plasma chemistry.


Publications

Thesis

  • Katharina Grosse, PhD thesis - 03/2021
    Discharge ignition, dynamics and chemistry of nanosecond pulsed plasmas in water
  • Maike Kai, Bachelor thesis - 09/2018
    Optical Analysis of a Nanosecond Plasma Inside Liquids
  • Chaiyasit Nenbangkaeo, Bachelor thesis - 07/2019
    Analysis of hydrogen peroxide production in nanosecond pulsed discharges in water
  • Thorben Holländer, Bachelor thesis - 12/2019
    Determination of the OH concentration in plasma treated liquids
  • Fatma-Nur Seferoglu, Bachelor thesis - 09/2019
    Surface modification of a copper substrate through the reaction chemistry generated by pulsed plasmas in water
  • Elia Jüngling, Bachelor thesis - 10/2021
    Propagation of streamers in nanosecond plasmas in water
  • Marina Falke, Bachelor thesis - 03/2021
    Comparison of nanosecond pulsed discharges in water for different pulse polarities
  • Pia-Victoria Pottkämper, PhD thesis - ongoing
  • Fatma-Nur Seferoglu, Master thesis - 11/2022
    Optical analysis of microsecond pulsed plasmas in liquids
  • Oliver Krettek, Bachelor thesis - 04/2023
    Investigation of Plasma-Assisted Nanoparticle Production at the Liquid-Solid Interface

Further reading

    Project presentation video